Laundry Mat (even if you have a washer/dryer...single guys abound at the laundry mat...and as a bonus, they know how to wash clothes or at least they are trying!)

Local park (cycling, walking, walking the dog kinda stuff)

Library (takes a bit more ingenuity because of the "shhh" factor, but with good observational skills...voila!)

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Minds are like parachutes. They only work when they are open.

~Thomas Dewar~